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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor4 *5 * Copyright (c) 2015 Measurement-Specialties6 *7 * (7-bit I2C slave address 0x40)8 *9 * Datasheet:10 * http://www.meas-spec.com/downloads/Digital_Sensor_TSYS02D.pdf11 */12 13#include <linux/init.h>14#include <linux/device.h>15#include <linux/kernel.h>16#include <linux/stat.h>17#include <linux/module.h>18#include <linux/iio/iio.h>19#include <linux/iio/sysfs.h>20 21#include "../common/ms_sensors/ms_sensors_i2c.h"22 23#define TSYS02D_RESET 0xFE24 25static const int tsys02d_samp_freq[4] = { 20, 40, 70, 140 };26/* String copy of the above const for readability purpose */27static const char tsys02d_show_samp_freq[] = "20 40 70 140";28 29static int tsys02d_read_raw(struct iio_dev *indio_dev,30 struct iio_chan_spec const *channel, int *val,31 int *val2, long mask)32{33 int ret;34 s32 temperature;35 struct ms_ht_dev *dev_data = iio_priv(indio_dev);36 37 switch (mask) {38 case IIO_CHAN_INFO_PROCESSED:39 switch (channel->type) {40 case IIO_TEMP: /* in milli °C */41 ret = ms_sensors_ht_read_temperature(dev_data,42 &temperature);43 if (ret)44 return ret;45 *val = temperature;46 47 return IIO_VAL_INT;48 default:49 return -EINVAL;50 }51 case IIO_CHAN_INFO_SAMP_FREQ:52 *val = tsys02d_samp_freq[dev_data->res_index];53 54 return IIO_VAL_INT;55 default:56 return -EINVAL;57 }58}59 60static int tsys02d_write_raw(struct iio_dev *indio_dev,61 struct iio_chan_spec const *chan,62 int val, int val2, long mask)63{64 struct ms_ht_dev *dev_data = iio_priv(indio_dev);65 int i, ret;66 67 switch (mask) {68 case IIO_CHAN_INFO_SAMP_FREQ:69 i = ARRAY_SIZE(tsys02d_samp_freq);70 while (i-- > 0)71 if (val == tsys02d_samp_freq[i])72 break;73 if (i < 0)74 return -EINVAL;75 mutex_lock(&dev_data->lock);76 dev_data->res_index = i;77 ret = ms_sensors_write_resolution(dev_data, i);78 mutex_unlock(&dev_data->lock);79 80 return ret;81 default:82 return -EINVAL;83 }84}85 86static const struct iio_chan_spec tsys02d_channels[] = {87 {88 .type = IIO_TEMP,89 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),90 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),91 }92};93 94static ssize_t tsys02_read_battery_low(struct device *dev,95 struct device_attribute *attr,96 char *buf)97{98 struct iio_dev *indio_dev = dev_to_iio_dev(dev);99 struct ms_ht_dev *dev_data = iio_priv(indio_dev);100 101 return ms_sensors_show_battery_low(dev_data, buf);102}103 104static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(tsys02d_show_samp_freq);105static IIO_DEVICE_ATTR(battery_low, S_IRUGO,106 tsys02_read_battery_low, NULL, 0);107 108static struct attribute *tsys02d_attributes[] = {109 &iio_const_attr_sampling_frequency_available.dev_attr.attr,110 &iio_dev_attr_battery_low.dev_attr.attr,111 NULL,112};113 114static const struct attribute_group tsys02d_attribute_group = {115 .attrs = tsys02d_attributes,116};117 118static const struct iio_info tsys02d_info = {119 .read_raw = tsys02d_read_raw,120 .write_raw = tsys02d_write_raw,121 .attrs = &tsys02d_attribute_group,122};123 124static int tsys02d_probe(struct i2c_client *client)125{126 const struct i2c_device_id *id = i2c_client_get_device_id(client);127 struct ms_ht_dev *dev_data;128 struct iio_dev *indio_dev;129 int ret;130 u64 serial_number;131 132 if (!i2c_check_functionality(client->adapter,133 I2C_FUNC_SMBUS_WRITE_BYTE_DATA |134 I2C_FUNC_SMBUS_WRITE_BYTE |135 I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {136 dev_err(&client->dev,137 "Adapter does not support some i2c transaction\n");138 return -EOPNOTSUPP;139 }140 141 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));142 if (!indio_dev)143 return -ENOMEM;144 145 dev_data = iio_priv(indio_dev);146 dev_data->client = client;147 dev_data->res_index = 0;148 mutex_init(&dev_data->lock);149 150 indio_dev->info = &tsys02d_info;151 indio_dev->name = id->name;152 indio_dev->modes = INDIO_DIRECT_MODE;153 indio_dev->channels = tsys02d_channels;154 indio_dev->num_channels = ARRAY_SIZE(tsys02d_channels);155 156 i2c_set_clientdata(client, indio_dev);157 158 ret = ms_sensors_reset(client, TSYS02D_RESET, 15000);159 if (ret)160 return ret;161 162 ret = ms_sensors_read_serial(client, &serial_number);163 if (ret)164 return ret;165 dev_info(&client->dev, "Serial number : %llx", serial_number);166 167 return devm_iio_device_register(&client->dev, indio_dev);168}169 170static const struct i2c_device_id tsys02d_id[] = {171 { "tsys02d" },172 {}173};174MODULE_DEVICE_TABLE(i2c, tsys02d_id);175 176static struct i2c_driver tsys02d_driver = {177 .probe = tsys02d_probe,178 .id_table = tsys02d_id,179 .driver = {180 .name = "tsys02d",181 },182};183 184module_i2c_driver(tsys02d_driver);185 186MODULE_DESCRIPTION("Measurement-Specialties tsys02d temperature driver");187MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");188MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");189MODULE_LICENSE("GPL v2");190MODULE_IMPORT_NS(IIO_MEAS_SPEC_SENSORS);191